* {
    box-sizing: border-box;
}

body {
  margin: 0;
  border: 0;
  font-family: 'Roboto Mono', monospace;
}

h1 {
  font-size: 18px;
}

h2 {
  font-size: 16px;
}

h1,
h2 {
  text-align: center;
}

.top,
.middle,
.bottom {
  width: 100px;
  height: 100px;
  background-color: dodgerblue;
  border: 2px solid lightgrey;
  margin: 10px 30px;
}

.top.side {
  flex-shrink: 2;
}

.top.center {
  flex-shrink: 1;
}

.middle.side {
  flex-shrink: 0;
}

.middle.center {
}

.bottom.side {

}

.bottom.center {
  flex-shrink: 2;
}

#top,
#middle,
#bottom {
  display: flex;
  background-color: whitesmoke;
  justify-content: center;
  min-height: 200px;
  align-items: center;
}
